/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package br.edu.fatec.servlets;

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import br.edu.fatecmm.classes.Calculadora; 

/**
 *
 * @author raphael
 */
public class Calcular extends HttpServlet {

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        /**************/
        int n1 = 0;
        int n2 = 0;
        int resultado = 0;
        String operacao = "";
        Calculadora calc = new Calculadora();
        
        //request = o webserver recebe o request(pedido) do http
        //response = o webserver devolve a informação via http (resposta)
        operacao = request.getParameter("operacao");
        n1 = Integer.parseInt(request.getParameter("n1"));
        n2 = Integer.parseInt(request.getParameter("n2"));
        
        if("soma".equals(operacao)) {
                    resultado = calc.soma(n1, n2);
                }
        if("subtracao".equals(operacao)) {
                    resultado = calc.subtracao(n1, n2);
                }
        if("multiplicacao".equals(operacao)) {
                    resultado = calc.multiplicacao(n1, n2);
                }
        if("divisao".equals(operacao)) {
                    resultado = calc.divicao(n1, n2);
                }        
        /**************/
        
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter out = response.getWriter();
        try {
            /* TODO output your page here. You may use following sample code. */
            out.println("<html>");
            out.println("<head>");
            out.println("<title>Servlet Calcular</title>");            
            out.println("</head>");
            out.println("<body>");
            //out.println("<h1>Servlet Calcular at " + request.getContextPath() + "</h1>");
            out.println("<h1>Resultado =  " + resultado + "</h1>");
            out.println("</body>");
            out.println("</html>");
        } finally {            
            out.close();
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
